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K. Sato

Publications
90
Citations
1,516
Publications by Year
19812005
Co-Authors:
Show All Co-Authors (141)
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K. Sato

Affiliation

NTT Network Innovation Laboratories
NTT Corporation
Yokosuka, Kanagawa, Japan

Publication Topics

Biography

Kenji Sato (M'95) received the B.S. degree in 1978, the M.S. degree in 1980, and the Ph.D. degree in 1992 from Nagoya University, Nagoya, Japan.,In 1980, he joined NTT Electrical Communications Laboratories, Tokyo, Japan. He is now a Senior Research Engineer with the NTT Network Innovation Laboratories, Kanagawa, Japan. His current interests include optical short pulse sources and its applications to high-speed fiber transmission systems.,Dr. Sato is a member of IEEE Lasers and Electro-Optics Society, the Physical Society of Japan, the Japan Society of Applied Physics, and the Institute of Electronics, Information, and Communication Engineers (IEICE) of Japan.(Based on document published on 27 December 2005).
Publications
90
Citations
1,516
Publications by Year
19812005
Co-Authors:
Show All Co-Authors (141)
Author's Published Works

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Pump-wavelength detuning method for forward-pumped distributed Raman amplification systems

H. Masuda;K. Sato;Y. Miyamoto

2005 Pacific Rim Conference on Lasers & Electro-Optics
Year: 2005 | Conference Paper |
Cited by: Papers (2) | Patents (1)
We propose a novel pump-wavelength detuning method for forward-pumped DRA systems that can suppress the excess noise caused by ND-FWM and the RIN transfer between the pump and signal lights in a WDM transmission system.Show More

Pump-wavelength detuning method for forward-pumped distributed Raman amplification systems

H. Masuda;K. Sato;Y. Miyamoto

Year: 2005 | Conference Paper |

Mode-locking mechanism of the 40-GHz regeneratively mode-locked laser diode with 160-GHz optical pulse injection

T. Ohno;T. Ito;K. Yoshino;K. Sato;H. Ito

IEEE Journal of Selected Topics in Quantum Electronics
Year: 2005 | Volume: 11, Issue: 5 | Journal Article |
Mechanism of injection locking with harmonic-frequency input pulses in a regeneratively mode-locked laser diode is investigated. We propose a model, in which the modulation sidebands generated near the free-running clock component causes mode locking, and the model is consistent with the behaviors of the measured timing jitter and optical modulation index. Mode locking of this laser with 320-GHz p...Show More

Mode-locking mechanism of the 40-GHz regeneratively mode-locked laser diode with 160-GHz optical pulse injection

T. Ohno;T. Ito;K. Yoshino;K. Sato;H. Ito

Year: 2005 | Volume: 11, Issue: 5 | Journal Article |

Chirp characteristics of 40-gb/s directly Modulated distributed-feedback laser diodes

K. Sato;S. Kuwahara;Y. Miyamoto

Journal of Lightwave Technology
Year: 2005 | Volume: 23, Issue: 11 | Journal Article |
For short-reach applications, 40-Gb/s directly modulated semiconductor lasers enable high-capacity transmission with a simple and low-cost configuration. We investigated the chirp characteristics of 40-Gb/s directly modulated 1.55-/spl mu/m distributed-feedback laser diodes (DFB-LDs) and measured the linewidth enhancement factor and dynamic chirp. We then evaluated the fiber-dispersion dependence ...Show More

Chirp characteristics of 40-gb/s directly Modulated distributed-feedback laser diodes

K. Sato;S. Kuwahara;Y. Miyamoto

Year: 2005 | Volume: 23, Issue: 11 | Journal Article |

Supercontinuum lightwave generation employing a mode-locked laser diode with injection locking for a highly coherent optical multicarrier source

K. Mori;K. Sato

IEEE Photonics Technology Letters
Year: 2005 | Volume: 17, Issue: 2 | Journal Article |
Cited by: Papers (13)
A supercontinuum (SC) lightwave is generated by employing a mode-locked laser diode with injection locking for the first time. The 25-GHz-spaced optical carriers in the generated SC lightwave over seamless S-, C-, and L-bands are locked to an optical frequency of 193.1 THz. The injection of a master light improved both the signal-to-noise ratio and linewidth of the optical carriers.Show More

Supercontinuum lightwave generation employing a mode-locked laser diode with injection locking for a highly coherent optical multicarrier source

K. Mori;K. Sato

Year: 2005 | Volume: 17, Issue: 2 | Journal Article |

Wide-locking-range 160-GHz optical clock recovery from 160-Gbit/s signal using a mode-locked laser diode

T. Ohno;R. Iga;Y. Kondo;T. Ito;T. Furuta;K. Yoshino;H. Ito;K. Sato

Optical Fiber Communication Conference, 2004. OFC 2004
Year: 2004 | Conference Paper |
Cited by: Papers (3)
A 160-GHz optical clock is recovered from a 160-Gbit/s signal using a mode-locked laser diode in a wide wavelength range. The locking range is over 700 MHz due to the integrated chirped distributed Bragg reflector.Show More

Wide-locking-range 160-GHz optical clock recovery from 160-Gbit/s signal using a mode-locked laser diode

T. Ohno;R. Iga;Y. Kondo;T. Ito;T. Furuta;K. Yoshino;H. Ito;K. Sato

Year: 2004 | Volume: 1 | Conference Paper |

160-Gb/s OTDM transmission using integrated all-optical MUX/DEMUX with all-channel modulation and demultiplexing

T. Ohara;H. Takara;I. Shake;K. Mori;K. Sato;S. Kawanishi;S. Mino;T. Yamada;M. Ishii;I. Ogawa;T. Kitoh;K. Magari;M. Okamoto;R.V. Roussev;J.R. Kurz;K.R. Parameswaran;M.M. Fejer

IEEE Photonics Technology Letters
Year: 2004 | Volume: 16, Issue: 2 | Journal Article |
Cited by: Papers (46)
This letter provides the first report of 160-Gb/s optical time-division-multiplexed transmission with all-channel independent modulation and all-channel simultaneous demultiplexing. By using a multiplexer and a demultiplexer based on periodically poled lithium niobate and semiconductor optical amplifier hybrid integrated planar lightwave circuits, 160-km transmission is successfully demonstrated.Show More

160-Gb/s OTDM transmission using integrated all-optical MUX/DEMUX with all-channel modulation and demultiplexing

T. Ohara;H. Takara;I. Shake;K. Mori;K. Sato;S. Kawanishi;S. Mino;T. Yamada;M. Ishii;I. Ogawa;T. Kitoh;K. Magari;M. Okamoto;R.V. Roussev;J.R. Kurz;K.R. Parameswaran;M.M. Fejer

Year: 2004 | Volume: 16, Issue: 2 | Journal Article |

A 160-GHz semiconductor mode-locked laser directly driven by an 80-GHz electrical signal

T. Ohno;R. Iga;Y. Kondo;T. Furuta;K. Yoshino;H. Ito;K. Sato

OFC 2003 Optical Fiber Communications Conference, 2003.
Year: 2003 | Conference Paper |
163.66-GHz optical pulse train was generated by a semiconductor mode-locked laser integrated with a high-mesa EA modulator synchronized with 81.83-GHz electrical signal. Timing jitter of 0.15 ps and very low amplitude modulation noise are achieved.Show More

A 160-GHz semiconductor mode-locked laser directly driven by an 80-GHz electrical signal

T. Ohno;R. Iga;Y. Kondo;T. Furuta;K. Yoshino;H. Ito;K. Sato

Year: 2003 | Conference Paper |

Optical pulse generation using fabry-Pe/spl acute/rot lasers under continuous-wave operation

K. Sato

IEEE Journal of Selected Topics in Quantum Electronics
Year: 2003 | Volume: 9, Issue: 5 | Journal Article |
Optical pulse generation at 100 GHz using a 1.5-μm Fabry-Pe/spl acute/rot laser is experimentally demonstrated under continuous-wave operation. Although the output from the laser is almost constant, subpicosecond pulses at 100 GHz are obtained after propagation through a single-mode fiber with an adequate anomalous dispersion. The measured radio frequency spectrum confirms that the multiple longit...Show More

Optical pulse generation using fabry-Pe/spl acute/rot lasers under continuous-wave operation

K. Sato

Year: 2003 | Volume: 9, Issue: 5 | Journal Article |

40-GHz optical clock recovery from a 160-Gbit/s optical data stream using a regeneratively mode-locked semiconductor laser

T. Ohno;K. Sato;T. Shimizu;T. Furuta;H. Ito

2002 28TH European Conference on Optical Communication
Year: 2002 | Conference Paper |
Cited by: Papers (4)
We demonstrate 40-GHz optical clock recovery from a 160-Gbit/s data stream using a regeneratively mode-locked semiconductor laser. The regeneration loop was effective in achieving stable operation with low timing jitter.Show More

40-GHz optical clock recovery from a 160-Gbit/s optical data stream using a regeneratively mode-locked semiconductor laser

T. Ohno;K. Sato;T. Shimizu;T. Furuta;H. Ito

Year: 2002 | Volume: 3 | Conference Paper |

Direct modulation of a distributed feedback laser for 40-Gbit/s very-short-reach optical links

K. Sato;S. Kuwahara;Y. Miyamoto;N. Shimizu

Optical Fiber Communication Conference and Exhibit
Year: 2002 | Conference Paper |
Cited by: Papers (3)
We demonstrated direct modulation at 40-Gbit/s using a commercially available 1.3-/spl mu/m DFB laser. Clear eye opening observed for a bias current of up to 100 mA and output power of more than 11 dBm. BER measurements showed error-free operation. BER improvement was obtained for a negative dispersion fiber. These results indicate that directly-modulated DFB lasers have good potential for use as ...Show More

Direct modulation of a distributed feedback laser for 40-Gbit/s very-short-reach optical links

K. Sato;S. Kuwahara;Y. Miyamoto;N. Shimizu

Year: 2002 | Conference Paper |

Ultra-wideband tellurite/silica fiber Raman amplifier and supercontinuum lightwave source for 124-nm seamless bandwidth DWDM transmission

H. Takara;H. Masuda;K. Mori;K. Sato;Y. Inoue;T. Ohara;A. Mori;M. Kohtoku;Y. Miyamoto;T. Morioka;S. Kawanishi

Optical Fiber Communication Conference and Exhibit
Year: 2002 | Conference Paper |
Cited by: Papers (5)
We present over 120-nm-bandwidth optical elements; hybrid tellurite/silica fiber Raman post/inline amplifiers, a supercontinuum source, and an interleave filter. Using these elements, 124-nm-seamless bandwidth DWDM transmission (313 /spl times/ 10 Gbit/s, 160 km) is successfully conducted.Show More

Ultra-wideband tellurite/silica fiber Raman amplifier and supercontinuum lightwave source for 124-nm seamless bandwidth DWDM transmission

H. Takara;H. Masuda;K. Mori;K. Sato;Y. Inoue;T. Ohara;A. Mori;M. Kohtoku;Y. Miyamoto;T. Morioka;S. Kawanishi

Year: 2002 | Conference Paper |

Semiconductor light sources for 40-Gb/s transmission systems

K. Sato

Journal of Lightwave Technology
Year: 2002 | Volume: 20, Issue: 12 | Journal Article |
Cited by: Papers (31)
The status and prospects of semiconductor light sources for 40-Gb/s transmission systems are reviewed in regard to the following three topics: direct modulation, external modulation, and pulse sources for return-to-zero format. Included are discussions on direct modulation of a 1.3-/spl mu/m distributed feedback laser for 40-Gb/s very-short-reach optical links, progress made in developing external...Show More

Semiconductor light sources for 40-Gb/s transmission systems

K. Sato

Year: 2002 | Volume: 20, Issue: 12 | Journal Article |

Pulse generation at 100 GHz using Fabry-Perot lasers

K. Sato

IEEE 18th International Semiconductor Laser Conference
Year: 2002 | Conference Paper |
Summary form only given. Passive mode locking of InGaAsP strained MQW Fabry-Perot lasers for 100-GHz pulse generation is reported. Mode-locking instability appearing as frequency jumps was observed.Show More

Pulse generation at 100 GHz using Fabry-Perot lasers

K. Sato

Year: 2002 | Conference Paper |

32 wavelength tunable mode-locked laser with 100 GHz channel spacing using an arrayed waveguide grating

K.R. Tamura;Y. Inoue;K. Sato;T. Komukai;A. Sugita;M. Nakazawa

OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171)
Year: 2001 | Conference Paper |
Cited by: Patents (1)
We demonstrate a discretely tunable mode-locked laser (time-to-wavelength mapped laser) consisting of a 32 wavelength silica-on-silicon planar lightwave circuit arrayed waveguide grating and an integrated electro-absorption modulator/semiconductor optical amplifier. The AWG is used to form a wavelength-dependent delay circuit to allow the oscillation wavelength to be selected by varying the modelo...Show More

32 wavelength tunable mode-locked laser with 100 GHz channel spacing using an arrayed waveguide grating

K.R. Tamura;Y. Inoue;K. Sato;T. Komukai;A. Sugita;M. Nakazawa

Year: 2001 | Volume: 2 | Conference Paper |

A high SNR, 150 ch supercontinuum CW optical source with precise 25 GHz spacing for 10 Gbit/s DWDM systems

E. Yamada;H. Takara;T. Ohara;K. Sato;T. Morioka;K. Jinguji;M. Itoh;M. Ishii

OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171)
Year: 2001 | Conference Paper |
Cited by: Papers (8) | Patents (2)
A 150 channel multi-wavelength CW optical source with precise 25 GHz spacing is successfully realized by longitudinal mode slicing of a supercontinuum spectrum. We confirm the generation of more than 150 CW channels ranging from 1530 to 1560 nm with SNRs over 28.2 dB and Q-factors over 20.8 dB which are sufficient for 10 Gbit/s multi-span DWDM transmission.Show More

A high SNR, 150 ch supercontinuum CW optical source with precise 25 GHz spacing for 10 Gbit/s DWDM systems

E. Yamada;H. Takara;T. Ohara;K. Sato;T. Morioka;K. Jinguji;M. Itoh;M. Ishii

Year: 2001 | Volume: 1 | Conference Paper |

A discretely tunable mode-locked laser with 32 wavelengths and 100-GHz channel spacing using an arrayed waveguide grating

K.R. Tamura;Y. Inoue;K. Sato;T. Komukai;A. Sugita;M. Nakazawa

IEEE Photonics Technology Letters
Year: 2001 | Volume: 13, Issue: 11 | Journal Article |
Cited by: Papers (3)
We demonstrate a tunable mode-locked laser (time-to-wavelength mapped laser) with a 100-GHz channel spacing (1535.5-1560.5 nm) that uses a 32-wavelength silica-on-silicon planar lightwave circuit arrayed waveguide grating (AWG) for realizing a wavelength-dependent delay. The wavelength is selected by changing the mode-locking frequency. Mode-locking was realized by modulating the electroabsorption...Show More

A discretely tunable mode-locked laser with 32 wavelengths and 100-GHz channel spacing using an arrayed waveguide grating

K.R. Tamura;Y. Inoue;K. Sato;T. Komukai;A. Sugita;M. Nakazawa

Year: 2001 | Volume: 13, Issue: 11 | Journal Article |

Reduction of mode partition noise by using semiconductor optical amplifiers

K. Sato;H. Toba

IEEE Journal of Selected Topics in Quantum Electronics
Year: 2001 | Volume: 7, Issue: 2 | Journal Article |
Reduction of mode partition noise induced by spectral filtering of Fabry-Perot lasers is demonstrated by using a semiconductor optical amplifier (SOA). Because the SOA acts as a high-pass filter, the mode partition noise appearing at low frequencies can be suppressed. A 16-dB recovery of the signal-to-noise ratio and a 6.2-dB recovery of the Q factor are obtained.Show More

Reduction of mode partition noise by using semiconductor optical amplifiers

K. Sato;H. Toba

Year: 2001 | Volume: 7, Issue: 2 | Journal Article |

106 /spl times/ 10 Gbit/s, 25 GHz-spaced, 640 km DWDM transmission employing a single supercontinuum multi-carrier source

H. Takara;E. Yamada;T. Ohara;K. Sato;K. Jinguji;Y. Inoue;T. Shibata;T. Morioka

Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH37170)
Year: 2001 | Conference Paper |
Cited by: Papers (6)
Summary form only given. Future photonic networks will need to generate over one hundred optical carriers (modes) at ITU grids with well-controlled spacing. Supercontinuum (SC) generation is an effective way of obtaining such well-managed optical carriers by broadening the input optical pulse spectrum while maintaining coherency. Some of the advantages of using SC are a fixed channel spacing with ...Show More

106 /spl times/ 10 Gbit/s, 25 GHz-spaced, 640 km DWDM transmission employing a single supercontinuum multi-carrier source

H. Takara;E. Yamada;T. Ohara;K. Sato;K. Jinguji;Y. Inoue;T. Shibata;T. Morioka

Year: 2001 | Conference Paper |

Mode-locked lasers for 43 Gb/s carrier-suppressed return-to-zero pulse generation

K. Sato;S. Kuwahara;Y. Miyamoto;K. Murata;H. Miyazawa

Proceedings 27th European Conference on Optical Communication (Cat. No.01TH8551)
Year: 2001 | Conference Paper |
Cited by: Papers (2) | Patents (2)
Optical pulse sources based on mode-locked lasers are reported for 43 Gb/s carrier-suppressed return-to-zero pulse generation. A 150 km dispersion-shifted-fiber L-band transmission is demonstrated using the pulse source.Show More

Mode-locked lasers for 43 Gb/s carrier-suppressed return-to-zero pulse generation

K. Sato;S. Kuwahara;Y. Miyamoto;K. Murata;H. Miyazawa

Year: 2001 | Volume: 3 | Conference Paper |

Reduction of mode partition noise by using semiconductor optical amplifiers

K. Sato;H. Toba

Conference Digest. 2000 IEEE 17th International Semiconductor Laser Conference. (Cat. No.00CH37092)
Year: 2000 | Conference Paper |
Cited by: Papers (3)
Multi-wavelength light sources by narrow-band spectral filtering of multi-mode lasers have been studied for wavelength division multiplexing (WDM) applications. Long-wavelength Fabry-Perot (FP) semiconductor lasers provide many modes, whose mode spacing can be fixed with precise frequency by using a mode locking technique. However, increased intensity noise has been observed in the spectral filter...Show More

Reduction of mode partition noise by using semiconductor optical amplifiers

K. Sato;H. Toba

Year: 2000 | Conference Paper |

Pulse to pulse coherency of actively mode-locked laser diodes

Joong-Hee Lee;A.S. Daryoush;K. Sato

International Topical Meeting on Microwave Photonics. MWP'99. Technical Digest (Cat. No.99EX301)
Year: 1999 | Conference Paper |
Mode-locked lasers are potentially viable in distribution of frequency reference signals in many distributed systems. Phase noise degradation of the reference signal distributed by a monolithically integrated electro-absorption (EA) modulator with multiple quantum well (MQW) laser diode is investigated. The FM noise degradation dependence on EA modulator bias voltage is correlated to pulse to puls...Show More

Pulse to pulse coherency of actively mode-locked laser diodes

Joong-Hee Lee;A.S. Daryoush;K. Sato

Year: 1999 | Conference Paper |

Chirp-compensated 40-GHz mode-locked lasers integrated with electroabsorption modulators and chirped gratings

K. Sato;A. Hirano;H. Ishii

IEEE Journal of Selected Topics in Quantum Electronics
Year: 1999 | Volume: 5, Issue: 3 | Journal Article |
Cited by: Papers (52)
40-GHz short-pulse generation of monolithic mode-locked lasers integrated with electroabsorption modulators and chirped gratings is reported. Theoretical analysis of active mode-locking based on a Gaussian model is described. Chirped gratings are shown to compensate the optical-frequency chirp and extend the repetition frequency range. Nearly transform-limited pulses of less than 4 ps are experime...Show More

Chirp-compensated 40-GHz mode-locked lasers integrated with electroabsorption modulators and chirped gratings

K. Sato;A. Hirano;H. Ishii

Year: 1999 | Volume: 5, Issue: 3 | Journal Article |

Efficient optoelectronic mixing at Ka-band using a mode-locked laser

A.S. Daryoush;K. Sato;K. Horikawa;H. Ogawa

IEEE Microwave and Guided Wave Letters
Year: 1999 | Volume: 9, Issue: 8 | Magazine Article |
Cited by: Papers (6)
The authors present optoelectronic mixing of data signals with a carrier signal in a mode-locked semiconductor laser diode. A long Fabry-Perot (FP) laser at 1.5 μm, which is monolithically integrated with an electro-absorption modulator, is mode-locked at 19.3 GHz through loss modulation. The gain section of the mode-locked laser is modulated by S-band signals. Modulation sidebands are observed in...Show More

Efficient optoelectronic mixing at Ka-band using a mode-locked laser

A.S. Daryoush;K. Sato;K. Horikawa;H. Ogawa

Year: 1999 | Volume: 9, Issue: 8 | Magazine Article |

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